Aroma diffuser



FIG. 1 is a front elevational view of an aroma diffuser showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a rear perspective view thereof;

FIG. 8 is a top, front and right side perspective view thereof; and,

FIG. 9 is an enlarged view of portion 9 in FIG. 8. 

CLAIM The ornamental design for an aroma diffuser, as shown and described. 